steve wrote:It's not a mistake - Wm-2 is an alternative way of writing W/m2. Not sure why Mark chose to do it that way, though.

Just that it takes up less space, and I'm used to writing it like that back from my physics days. I have seen an issue with it though in that I use the superscript "-" character, and some systems do not seem to have that character in their fonts. So maybe I should change it to W/m2